Some foods can make you sick if they are stored in conditions that are not cold enough to prevent the growth of harmful organisms.

VOA: special.2009.11.30

It's a common bacterium and most strains of E. Coli are not harmful to people, in fact, they provide us with some beneficial properties.

它是常见菌,且大多数种类的菌株对人类无害,实际上还给了我们颇多裨益

耶鲁公开课 - 生物医学工程探索课程节选

when you want someone to, not to do something that's going to be harmful or uncomfortable or strange.

或者你不希望某人做一些有害的，令人不安的或是奇怪的行为。

Don't 课堂 - SpeakingMax英语口语达人

This would result in people drinking smaller amounts that are not as harmful.

VOA: special.2009.09.08

So if you could stop a tumor from being able to develop blood vessels you might be able to stop its growth at a stage where it's not harmful.

所以,如果我们能通过阻止血管的生成,来阻止肿瘤的发展,就可以在肿瘤还处于良性阶段时扼制它

耶鲁公开课 - 生物医学工程探索课程节选

But a section of the country's labor code states that women should not do "hard,physical" labor that entails harmful or dangerous conditions.

VOA: standard.2009.11.05